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Vol. 4 No. 4 Fall 2008 Journal of Double Star Observations Page 175
Ludwig Schupmann Observatory Measures of
Large ∆m Pairs - Part Two
James A. Daley
Ludwig Schupmann Observatory
New Ipswich, NH
Email: rigel@net1plus.com
Abstract: This report, the second in this 3 part series, presents recent measurements in theta and rho
space of 50 components in 25 mostly large ∆ m systems. A comparatively small number of these pairs
are physical.
and the binaries displaying small but detectable
Introduction position changes in most cases, the motions being
Difficulties attending CCD measurements of large reasonably consistent with previous measures- old
∆m pairs are described in an article by the author in a and recent. Most measures are the mean of at least 12
previous article (Daley, 2007). The specialized tail- CCD frames.
piece optics used to make the measures reported here Among the few discoveries is an interesting red
is also covered in that article and in a later article cpm pair in UMa (DAL 43, 12hr 05m 47.4988s +53○
(Daley, 2008). Keen-eyed observers such as S. W. 54' 55.491"). Photometric measures (currently incom-
Burnham, Alvan Graham Clark and the Herschel’s, plete) of this wide pair will be presented in a future
William and John, were dominant in the discovery of article.
these contrasting component pairs. They usually
employed the biggest reflectors and refractors of the Some CCD Images
time. It is only recently, with the introduction of the Figure 1 shows STF 1110 (Castor), a popular fast
CCD, that amateurs with small telescopes have an moving pair. Both the A and B components are clearly
opportunity to measure these systems. resolved behind the foil. The slightly overexposed
image of the eclipsing red pair YY Gem, which is
The Measures
physical with Castor, and the faint optical component
The following data is listed in the conventional "D" are well shown in this 10 second unfiltered expo-
way. From left to right: the discoverer's designation , sure.
WDS identifier (Epoch 2000 RA & Dec), WDS mags Figure 2 shows an image of BU 103 (upsilon Gem)
rounded off to the first place (LSO unfiltered CCD with the primary highly attenuated behind the oc-
"red" magnitudes in bold italics are ∆m inferred from culting foil strip. Relying on the one discovery meas-
known stars in the system), LSO position angle in ure 97-years ago, careful graphing demonstrates that
degrees, LSO separation in seconds of arc, decimal the apparent motion of the secondary is precisely
date of observation, number of nights observed and a what is predicted by the proper motion of the primary,
notes column. In the notes column entries such as thus the companion is almost certainly optical.
5m83 signifies 5 previous measures, the last being 83 Finally, Figure 3 is an image of Sirius utilizing a
years ago. Other self explanatory items, perhaps of square aperture mask and no occultor. Although
interest, appear in this column. interesting, it would be a challenge to measure. How-
There is no note section as all-in-all the work, ever, the intersection of the diffraction spikes may
although tedious, was without surprise; the optical give a reasonably good location of the primary as the
components, for the most part, showing giant motions mask is positioned very close to the objective's first
Vol. 4 No. 4 Fall 2008 Journal of Double Star Observations Page 176
Ludwig Schupmann Observatory Measures of Large ∆m Pairs - Part Two
surface. A set of occulted images of Sirius were used
for the included LSO measure and may be presented
in a future article As with the other images, North is
up and East is left.
All images shown here are single frames (no
stacking).
This ongoing measurement program is guided by
an observation list generated by Brian Mason based
on LSO's instrumentation capability and, in general,
covers a ∆m range of 8 to 12 with the primary compo-
nent no fainter than 4.5. Measurements are per-
formed with a 9-inch aperture Schupmann medial
telescope, a tailpiece stellar coronagraph and an
unfiltered ST-7XE CCD.
Figure 1: Castor (STF1110) with A B components visible
through filter.
References
Daley, J.A. (2007), "A Method of Measuring High
Delta m Doubles", JDSO, vol 3, pg 159 - 164.
Daley, J.A. (2008), "Ludwig Schupmann Observatory
Measures of Large ∆m Pairs - Part One", JDSO,
vol 4, 34 - 39.
Figure 2: Image of υ Gem, almost certainly an optical dou-
ble (see text).
Figure 3: Image of Sirius and B component taken with no Table begins on next page.
occultor
Vol. 4 No. 4 Fall 2008 Journal of Double Star Observations Page 177
Ludwig Schupmann Observatory Measures of Large ∆m Pairs - Part Two
Discoverer RA & Dec Mags PA Sep Date n Notes
BU 554AB 05020+4349 3.0 14.0 225.2 29.72 2008.129 1 5m83, Epsilon Aur, binary
BU 554AC 05020+4349 3.0 11.3 275.5 43.44 2008.129 1
BU 554AD 05020+4349 3.0 12.0 316.4 45.14 2008.129 1 5m83
STF 668A-BC 05145-0812 0.3 6.8 203.5 9.20 2008.120 2 Rigel
BU 555AD 05145-0812 0.3 10.5 1.1 44.60 2008.121 3 5m87, red mag of D
BU 558Aa-B 05320-0018 2.2 14.0 228.3 33.41 2008.129 1 Delta Ori
STF 14Aa-C 05320-0018 2.2 6.8 0.2 52.49 2008.129 1 binary
BU 1056AB-C 06024+0939 4.1 14.0 284.7 18.91 2008.151 1 7m53 Mu Ori
BU 1405AC 06041+2316 4.3 13.0 24.9 105.61 2008.153 1 1 Gem
J 2016AB 06119+1413 4.5 13.0 186.6 37.81 2008.153 1 Xi Ori
J 2016BC 06119+1413 12.3 2.3 150.5 4.68 2008.153 1 2m24
DAL 40AD 06119+1413 4.5 11.4 164.0 36.01 2008.153 1 new component, red mag
DAL 40AE 06119+1413 4.5 11.8 22.2 43.52 2008.153 1 new component, red mag
HJ 348AB 06149-0617 4.0 13.1 26.1 53.74 2008.162 1 1m 103, Gamma Mon
DAL 41AC 06149-0617 4.0 13.6 308.1 47.89 2008.162 1 new component, red mag
STF 900AB 06238+0436 4.4 6.6 28.9 12.50 2008.173 1 Epsilon Mon
STF 900AC 06238+0436 4.4 12.7 254.1 91.80 2008.173 1
AGC 1AB 06451-1643 -1.5 8.5 97.2 8.07 2008.151 1 Sirius
BU 1411AF 06451-1643 -1.5 9.5 62.1 122.75 2008.271 1 4m33, estimated red mag
SHJ 77AC 07041+2034 4.0 7.7 347.0 101.27 2008.181 1 Zeta Gem
SHJ 77AD 07041+2034 3.8 12.0 353.5 67.75 2008.181 1 2m24,
SHJ 77CD 07041+2034 7.8 12.9 154.1 34.71 2008.181 1
J 58 07119-0030 4.1 13.0 171.7 33.21 2008.181 1 Delta Mon
BUP 101AB 07272+0817 2.9 13.0 77.1 48.97 2008.192 1 Beta CMi
BUP 101AC 07272+0817 2.9 11.2 25.3 104.15 2008.192 1
BUP 101AD 07272+0817 2.9 11.1 75.71 131.82 2008.192 1
BUP 101AE 07272+0817 2.9 313.6 138.33 2008.192 1
SLE 571AF 07272+0817 2.9 12.5 166.6 79.66 2008.192 1
SLE 571AG 07272+0817 2.9 13.0 176.7 83.83 2008.192 1
SLE 571FG 07272+0817 12.5 13.0 245.3 15.13 2008.192 1
Table continued on next page.
Vol. 4 No. 4 Fall 2008 Journal of Double Star Observations Page 178
Ludwig Schupmann Observatory Measures of Large ∆m Pairs - Part Two
Discoverer RA & Dec Mags PA Sep Date n Notes
new component, red dm=
DAL 41FH 07272+0817 12.5 13.4 53.7 3.96 2008.192 1
0.9
LAM 4AB 07282+0856 4.3 13.3 233.7 26.62 2008.181 1 5m24, Gamma CMi
LAM 4AC 07282+0856 4.3 12.3 261.4 114.50 2008.181 1 1m97
STF1110AC 07346+3153 1.9 10.1 163.5 70.54 2008.246 1 Castor, C is YY Gem
STF1110AD 07346+3153 1.9 10.1 221.4 182.97 2008.246 1
BUP 103 07359+2654 4.1 13.2 40.4 55.17 2008.181 1 1m97, Upsilon Gem
LAM 6AC 07393+0514 0.4 11.7 20.5 177.17 2008.246 1 51m24, Procyon
BU 1065AB 08165+0911 3.5 14.3 293.6 30.14 2008.194 1 Beta Cnc, binary
DAL 42AC 08165+0911 3.5 12.2 37.7 69.77 2008.194 1 new component
RST5507 08464-1333 4.3 13.7 266.4 27.12 2008.227 1 12 Hya
STF1273AB-D 08468+0625 3.5 12.5 199.7 18.03 2008.225 1 Eps Hya, Hyperbolic orbit
HJ 2489AB 09144+0219 3.9 9.8 241.0 20.30 2008.230 1 Theta Hya
HJ 2489AC 09144+0219 3.8 11.9 298.4 100.96 2008.230 1 2m46
B 2674AD 09144+0219 4.6 12.4 145.4 82.35 2008.230 1
GAN 5 10079+1000 4.4 13.6 40.8 7.98 2008.230 1 7m74, 31 Leo, cpm
STF 6AB 10084+1158 1.4 8.24 307.3 176.98 2008.271 1 Regulus
BU 593AB 10106-1221 3.6 13.3 103.0 71.34 2008.271 1 5m86, Lambda Hydra
DAL 43 12058+5355 9.2 11.9 349.9 55.24 2008.408 1 discovery, red cpm pair
BLL 29 12154+5702 3.3 10.2 73.50 182.03 2008.399 2 Megrez
BUP 140AC 12154+5702 3.3 12.0 128.0 175.33 2008.399 2
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